The GDAL library is required if any of the serialized geometries need
coordinate transformations (that is if the geometry’s spatial reference system
differs from the srid serializer option).

Изменено в Django 1.9:

The GeoJSON serializer no longer needs GDAL if all geometries are in the
same coordinate system as the srid serializer option.

The geojson serializer is not meant for round-tripping data, as it has no
deserializer equivalent. For example, you cannot use loaddata to
reload the output produced by this serializer. If you plan to reload the
outputted data, use the plain json serializer
instead.

In addition to the options of the json serializer, the geojson
serializer accepts the following additional option when it is called by
serializers.serialize():

geometry_field: A string containing the name of a geometry field to use
for the geometry key of the GeoJSON feature. This is only needed when you
have a model with more than one geometry field and you don’t want to use the
first defined geometry field (by default, the first geometry field is picked).

srid: The SRID to use for the geometry content. Defaults to 4326
(WGS 84).

The fields option can be used to limit fields that
will be present in the properties key, as it works with all other
serializers.